Display panel, and display device and electronic device using thereof

ABSTRACT

A display panel includes a first substrate, a second a second substrate a second a second substrate parallel and opposite to the first substrate, a liquid crystal molecules disposed between the first substrate and the second substrate, a first and a second polarizers disposed over the first and the second substrates respectively. The first surface of the first substrate close to the liquid crystal molecules and a second surface of the second substrate close to the liquid crystal molecules includes a first alignment surface and a second alignment surface, wherein an angle between the alignment directions of the first and the second alignment surfaces is in a range of about 90°. The angle between a direction of the absorption axis of the first polarizer/the second polarizer and the alignment direction of the first alignment surface/the second alignment surface is in a range of about 45° respectively.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the priority benefits of U.S. provisionalapplication titled “NEW WIDE VIEW TN DESIGN” filed on Sep. 21, 2004. Alldisclosure of this application is incorporated herein by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a display panel. More particularly, thepresent invention relates to a display panel of a liquid crystal displaydevice.

2. Description of Related Art

Conventionally, the application of liquid crystal material as liquidcrystal display (LCD) has been broadly used in many display fields. Thegeneration of LCD twisted nematic (TN), super twisted nematic (STN) LCDand double layer STN-LCD has evolved to its use as thin film transistor(TFT) LCD. The conventional LCD has advantages of thin thickness,light-weight, low power consuming and radiation free compared to theconventional cathode ray tube (CRT) display. However, the conventionalLCD at least has the problem of dependence of brightness and contrastratio on view angle, and the problem of gray scale inversion.

FIG. 1A is a schematic explosive view illustrating a structure of aconventional LCD panel. Referring to FIG. 1A, LCD panel 100 generallyincludes an upper substrate 102, a bottom substrate 104, liquid crystalmolecules 106 disposed between the substrates 102 and 104, polarizers108 and 110 disposed above the substrate 102 and under the substrate 104respectively, and a light source 112. In general, the bottom surface ofthe substrate 102 and the upper surface of the substrate 104 that areadjacent to the liquid crystal molecules 106 have to be rubbed to forman alignment surface for aligning the liquid crystal molecules 106. Thedirections D1 and D2 are perpendicular to each other, and they representthe rubbing directions of the bottom surface of the transparentsubstrate 102 and the upper surface of the substrate 104. As shown inFIG. 1A, the liquid crystal molecules 106 adjacent to the bottom surfaceof the substrate 102 and the upper surface of the substrate 104 arealigned parallel to the directions D1 and D2 respectively. Between thesubstrate 102 and 104, the liquid crystal molecules 106 are aligned indirections that rotate through 90° from the bottom surface of thesubstrate 102 to the upper surface of the substrate 104. In addition,the directions D3 and D4 of the absorption axis of the polarizers 108and 110 are parallel to the directions D1 and D2 respectively.

In FIG. 1A, there is no voltage difference between the substrates 102and 104. Therefore, when an unpolarized light source 112 passes throughthe polarizer 110, the polarization direction of the transmitted lightis perpendicular to the direction D4. Then, the polarization directionof the transmitted light will be rotated by the liquid crystal molecules106 and will be perpendicular to the direction D1 finally. Therefore,the transmitted light may pass through the polarizer 108 since thedirection D3 of the absorption axis of the polarizers 108 is parallel tothe direction D1.

FIG. 1B is a schematic explosive view illustrating an operation of aconventional LCD panel. In FIG. 1B, a voltage V is applied between thesubstrates 102 and 104, and thus the liquid crystal molecules 106 willbe aligned parallel to the direction of the electric field generated bythe voltage V. Therefore, when an unpolarized light source 112 passesthrough the polarizer 110, the polarization direction of the transmittedlight is perpendicular to the direction D4. However, the polarizationdirection of the transmitted light is not rotated by the liquid crystalmolecules 106 and will be still perpendicular to the direction D4finally. Therefore, the transmission light can not pass through thepolarizer 108 since the directions D3 of the absorption axis of thepolarizers 108 is perpendicular to the direction D4. Accordingly, thebrightness of the LCD panel 100 is dependent on the voltage V.

However, as shown in FIG. 1B, it should be noted that, only a middleportion of liquid crystal molecules 106 is aligned parallel to thedirection of the electric field, the liquid crystal molecules 106 thatnear the bottom surface of the substrate 102 and the upper surface ofthe substrate 104 are still influenced by the rubbing directions D1 andD2 respectively. Therefore, a light leakage may be generated and theperformance such as the contrast ratio of the LCD panel 100 may bereduced.

In order to improve the problem of the conventional LCD shown in FIGS.1A and 1B, an optical compensation film is developed. FIG. 2 is aschematic explosive view illustrating a structure of anotherconventional LCD. Referring to FIG. 2, except for the basic structure ofthe LCD panel 100, the LCD panel 200 further includes opticalcompensation films 212/214 disposed between the substrate 102/104 andthe polarizer 108/110 respectively. The direction D5 and D6 of theabsorption axis of the optical compensation films 212 and 214 aredisposed the same as the directions D3 and D4. The optical compensationfilms 212 and 214 are provided for compensating the difference of thereflective index of the liquid crystal molecules 106 as shown in FIG.1B. Therefore, the problem of light leakage is prevented and theperformance such as the contrast ratio of the LCD panel 200 is enhanced.

However, the LCD panel 200 shown in FIG. 2 has the followingdisadvantages. FIG. 3A is a plot of a contrast ratio versus a viewingangle of the LCD shown in FIG. 2. FIG. 3B is a schematic diagramillustrating a definition of the coordinate system for the viewingangle. It is noted that, the viewing angle of the plot of FIG. 3A isdefined in FIG. 3B, wherein the direction 312 is the observationdirection of the observer, the azimuthal coordinate is defined as theangle between the X-axis (0 degree) and the projection of the direction312 on the surface of the substrate 102 of the LCD panel 200, and theradial coordinate is defined as the angle between the direction 312 andthe Z-axis (i.e., the normal of the surface of the substrate 102 of theLCD panel 200.) The X-axis and the Z-axis are also illustrated in FIG.2. The diagram shown in FIG. 3A represents the contrast ratio of the LCDpanel 200 versus the viewing angle of the direction 312, wherein thecontrast ratio is defined as the ratio of the brightness of pixel inbright (without voltage between the substrates 102 and 104) to thebrightness of the pixel in dark (with voltage between the substrates 102and 104). It should be noted that, the contrast ratio of the hatchedarea shown in FIG. 3 is larger that 10, however, the contrast ratio ofthe area having an azimuthal coordinate is close to 270° is less than10.

FIG. 4 is a plot illustrating a gray scale inversion phenomenon of theLCD shown in FIG. 2. As shown FIG. 4, it is noted that as the azimuthalcoordinate is close to 90° or 270°, the gray scale inversion phenomenonis very serious since the gray scale of the marked areas shown in FIG. 4varies many times.

FIG. 5 is a diagram illustrating an observer and the LCD shown in FIG.2. Referring to FIG. 5, the image displayed by the LCD 200 shown in FIG.2 has a polarization direction D7 perpendicular to the direction D3.However, when the observer wears a pair of sunglasses 502, only aportion of the image having a polarization direction perpendicular to D8may be observed since the conventional sunglasses 502 generally has anabsorption axis with a direction D8 for filtering the sunlight.Therefore, the observed brightness of the image displayed by the LCD 200may be reduced drastically.

Accordingly, an LCD for improving the low contrast ratio as theazimuthal coordinate is close to 270°, reducing the gray scale inversionproblem and avoiding the reduction of brightness when a user views theLCD through a pair of polarized sunglasses is highly desirable.

SUMMARY OF THE INVENTION

Therefore, the present invention is related to an LCD panel forimproving the low contrast ratio as the azimuthal coordinate is close to270°, reducing the gray scale inversion problem and avoiding thereduction of brightness when a user views the LCD panel through a pairof polarized sunglasses.

In addition, the present invention is related to a display device forimproving the low contrast ratio as the azimuthal coordinate is close to270°, reducing the gray scale inversion problem and avoiding thereduction of brightness when a user views the LCD panel through a pairof polarized sunglasses.

Moreover, the present invention is also related to an electronic devicecomprising a display device for improving the low contrast ratio as theazimuthal coordinate is close to 270°, reducing the gray scale inversionproblem and avoiding the reduction of brightness when a user views theLCD panel through a pair of polarized sunglasses.

According to one embodiment of the present invention, the display panelcomprises a first substrate, a second substrate parallel and opposite tothe first substrate, a liquid crystal molecules disposed between thefirst substrate and the second substrate, a first polarizer disposedover the first substrate, and a second polarizer disposed over thesecond substrate. The first substrate comprises a first alignmentsurface in a first alignment direction, and the second substratecomprises a second alignment surface in a second alignment direction.The liquid crystal molecules are disposed between the first alignmentsurface and the second alignment surface. The first polarizer comprisesa first absorption axis and the second polarizer comprises a secondabsorption axis. The angle between the first absorption axis and thefirst alignment direction as well as an angle between the secondabsorption axis and the second alignment direction are in a range ofabout 45° respectively.

In one embodiment of the present invention, an angle between the firstalignment direction and the second alignment direction is in a range ofabout 90°.

In one embodiment of the present invention, the display panel furthercomprises a first optical compensation film disposed between the firstsubstrate and the first polarizer, and a second optical compensationfilm disposed between the second substrate and the second polarizer. Thefirst and the second optical compensation film comprises a first and asecond optical axis respectively. In addition, the first optical axisand the first alignment direction as well as the second optical axis andthe second alignment direction are in almost parallel.

In one embodiment of the present invention, an angle between the firstoptical axis and the first alignment direction as well as an anglebetween the second optical axis and the second alignment direction arein a range of about ±5° respectively.

In one embodiment of the present invention, a sign of a differencebetween double refractive index of the liquid crystal molecules isdifferent from a sign of a difference between double refractive index ofthe first optical compensation film or the second optical compensationfilm.

In one embodiment of the present invention, the first polarizer isdisposed on a side of the first substrate outside of the liquidcrystals, and the second polarizer is disposed on a side of the secondsubstrate outside of the liquid crystals.

According to one embodiment of the present invention, a display devicecomprising a display panel, a scan driver and a data driver is provided.The embodiments of the display panel has been described in detail andwill not be repeated again.

According to one embodiment of the present invention, an electronicdevice comprising a display device is provided. The display devicecomprises a display panel, a scan driver and a data driver. Theembodiments of the display panel has been described in detail and willnot be repeated again.

Accordingly, in the present invention, since the direction of theabsorption axis of the polarizer of the LCD panel is not substantiallyparallel to the direction of the rubbing of the alignment surface of thesubstrates of the LCD panel, the problem of the low contrast ratio asthe azimuthal coordinate is close to 270°, the problem of the gray scaleinversion and the reduction of brightness when a user wears such as asunglasses are improved drastically.

One or part or all of these and other features and advantages of thepresent invention will become readily apparent to those skilled in thisart from the following description wherein there is shown and describedone embodiment of this invention, simply by way of illustration of oneof the modes best suited to carry out the invention. As it will berealized, the invention is capable of different embodiments, and itsseveral details are capable of modifications in various, obvious aspectsall without departing from the invention. Accordingly, the drawings anddescriptions will be regarded as illustrative in nature and not asrestrictive.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are included to provide a furtherunderstanding of the invention, and are incorporated in and constitute apart of this specification. The drawings illustrate embodiments of theinvention and, together with the description, serve to explain theprinciples of the invention.

FIG. 1A is a schematic explosive view illustrating a structure of aconventional LCD panel.

FIG. 1B is a schematic explosive view illustrating an operation of aconventional LCD panel.

FIG. 2 is a schematic explosive view illustrating a structure of anotherconventional LCD.

FIG. 3A is a plot of a contrast ratio versus a viewing angle of the LCDshown in FIG. 2.

FIG. 3B is a schematic diagram illustrating a definition of thecoordinate system for the viewing angle.

FIG. 4 is a plot illustrating a distribution of the inversion phenomenonof the LCD shown in FIG. 2.

FIG. 5 is a diagram illustrating an observer and the LCD shown in FIG.2.

FIG. 6 is a schematic explosive view of a structure of an LCD accordingto one embodiment of the present invention.

FIG. 7 is a schematic explosive view of a structure of an LCD accordingto one embodiment of the present invention.

FIG. 8 is a plot of a contrast ratio versus a viewing angle of the LCDshown in FIG. 7 according to one embodiment of the present invention.

FIGS. 9A-9B are schematic views illustrating a difference between theobservation of a conventional LCD panel.

FIGS. 9C-9D are schematic views illustrating a difference between theobservation of an LCD according to one embodiment of the presentinvention.

FIG. 10 is a plot illustrating a gray scale inversion phenomenon of theLCD according to one embodiment of the present invention.

FIG. 11 is a diagram illustrating an observer and the LCD shown in FIG.7 according to one embodiment of the present invention.

FIG. 12 is a block diagram illustrating a display device according toone embodiment of the present invention.

FIG. 13 is a block diagram illustrating an electronic device accordingto one embodiment of the present invention.

DESCRIPTION OF EMBODIMENTS

The present invention now will be described more fully hereinafter withreference to the accompanying drawings, in which embodiments of theinvention are shown. This invention may, however, be embodied in manydifferent forms and should not be construed as limited to theembodiments set forth herein; rather, these embodiments are provided sothat this disclosure will be thorough and complete, and will fullyconvey the scope of the invention to those skilled in the art. Likenumbers refer to like elements throughout.

FIG. 6 is a schematic explosive view of a structure of an LCD accordingto one embodiment of the present invention. Referring to FIG. 6, an LCDpanel 600 may comprises an upper substrate 602, a bottom transparentsubstrate 604, liquid crystal molecules 606 disposed between thesubstrates 602 and 604, polarizers 608 and 610 disposed above thesubstrate 602 and under the substrate 604 respectively, and a lightsource 612. The light source may be, for example, a backlight sourceilluminates the LCD panel 600 from the bottom side of the substrate 604as illustrated in FIG. 6, or a front-light source illuminates the LCDpanel 600 from the upper side of the substrate 602 (not shown).

In one embodiment of the present invention, the bottom surface of thesubstrate 602 and the upper surface of the substrate 604 that close tothe liquid crystal molecules 606 may be rubbed to form an alignmentsurface for aligning the liquid crystal molecules 606. The directionsD11 and D12 are the rubbing directions of the bottom surface of thesubstrate 602 and the upper surface of the substrate 604 respectively.As shown in FIG. 6, the liquid crystal molecules 606 adjacent to thebottom surface of the transparent substrate 602 and the upper surface ofthe substrate 604 are aligned parallel to the directions D11 and D12respectively. In one embodiment of the present invention, the anglebetween the directions D11 and D12 is in a range of about 90°±10°, or ina preferable range of about 90°±5°. Between the substrates 602 and 604,the liquid crystal molecules 606 are aligned in directions that rotatethrough about 90°±10° or 90°±5° from the bottom surface of the substrate602 to the upper surface of the substrate 604. In one embodiment of thepresent invention, the angles between the directions D13/D14 of theabsorption axis of the polarizers 608/610 and the directions D11/D12 arein a range of about 45°±10° respectively, or in a preferable range ofabout 45°±5° respectively. It should be noted that, the directions D13and D14 of the absorption axis of the polarizers 608 and 610 shown inFIG. 6 are only illustrated for example and can not be used to limit thescope of the invention.

In another embodiment of the present invention, an optical compensationfilm (such as quarter wave plate or half wave plate) may also be adoptedfor the LCD panel. FIG. 7 is a schematic explosive view of a structureof an LCD according to one embodiment of the present invention.Referring to FIG. 7, except for the basic structure of the LCD panel600, the LCD panel 700 further comprises optical compensation films712/714 disposed between the substrates 602/604 and the polarizers608/610 respectively. The angles between the directions D15/D16 of theabsorption axis of the optical compensation films 712/714 and thedirections D11/D12 may be in a range of about ±10° respectively, or in apreferable range of about ±5° respectively. The optical compensationfilms 712 and 714 are adopted for compensating the difference of thereflective index of the liquid crystal molecules 606 as shown in FIG. 6.In one embodiment of the present invention, the sign of the differenceof the double refractive index of the liquid crystal molecules 606 isdifferent from the sign of the difference of the double refractive indexof the optical compensation films 712 and 714. Therefore, the problem oflight leakage is prevented and the performance such as the contrastratio of the LCD panel 700 is enhanced.

FIG. 8 is a plot of a contrast ratio versus a viewing angle of the LCDshown in FIG. 7 according to one embodiment of the present invention.FIG. 8 represents the contrast ratio of the LCD panel 700 versus theviewing angle (as the direction 312 based on the coordinate axis definedin reference to FIG. 3B), wherein the X-axis and the Z-axis are alsoillustrated in FIG. 7. The contrast ratio is defined as the ratio of thebrightness of pixel in bright (without voltage between the substrates602 and 604) to the brightness of the pixel in dark (with voltagebetween the substrates 602 and 604). It should be noted that, theproblem that the region at the azimuthal coordinate close to 270° havinga contrast ratio less than 10 of the conventional LCD shown in FIG. 3Ais eliminated. In addition, the four regions having a contrast ratioless than 10 as shown in FIG. 8 is smaller than the region shown in FIG.3.

FIG. 9A-9B are schematic views illustrating a difference between theobservation of a conventional LCD panel. Referring to FIG. 9A, when theLCD panel 200 shown in FIG. 2 is observed at an azimuthal coordinateequals to 0°, the observed directions D3 and D4 of the polarizers 108and 110 are mutually perpendicular. However, in FIG. 9B, when the LCDpanel 200 shown in FIG. 2 is observed at an azimuthal coordinate closeto 270° and at a radial coordinate close to, e.g., 70°, the observeddirections D3 and D4 of the polarizers 108 and 110 are not mutuallyperpendicular. Therefore, a light leakage may be generated as the LCDpanel 200 is observed from the view angle shown in FIG. 9B, and thus theregion 302 with a contrast ratio less than 10 is generated.

FIG. 9C-9D are schematic views illustrating a difference between theobservation of an LCD according to one embodiment of the presentinvention. Referring to FIG. 9C, when the LCD panel 600 or 700 shown inFIG. 6 or FIG. 7 is observed at an azimuthal coordinate equals to 0°,the observed directions D13 and D14 of the polarizers 608 and 610 aremutually perpendicular. However, in FIG. 9D, when the LCD panel 600 or700 shown in FIG. 6 or FIG. 7 is observed at an azimuthal coordinateclose to 270° and at a radial coordinate close to, e.g., 70°, theobserved directions D13 and D14 of the polarizers 608 and 610 are stillmutually perpendicular. Therefore, the region 302 with a contrast ratioless than 10 in the conventional LCD panel 200 is eliminated.

FIG. 10 is a plot illustrating a gray scale inversion phenomenon of theLCD according to one embodiment of the present invention. It is notedthat, the serious problem of the gray scale inversion phenomenon of theplot shown in FIG. 4 at the azimuthal coordinate is close to 90° or 270°is improved in the plot shown in FIG. 10. Especially, the problem thatthe gray scale inverts many times along the azimuthal coordinate 90° or270° as shown in FIG. 4 is eliminated since the gray scale only invertsat most two times along the azimuthal coordinate 270° as shown in FIG.10. In other words, the gray scale inversion phenomenon may also beimproved in the present invention.

FIG. 11 is a diagram illustrating an observer and the LCD shown in FIG.7 according to one embodiment of the present invention. Referring toFIG. 11, the image displayed by the LCD 700 shown in FIG. 7 has apolarization direction D17 perpendicular to the direction D13.Therefore, when the observer views the LCD with a conventional pair ofpolarized sunglasses 1102 having an absorption axis with a directionD18, for example, perpendicular to the polarization direction D17 of theimage displayed by the LCD 700, the brightness observed by the observerwith the sunglasses 1102 may not be significantly reduced as compared tothe prior art.

FIG. 12 is a block diagram illustrating a display device according toone embodiment of the present invention. The display device 1200 maycomprise, for example, a display panel 1202, a scan driver 1204connected to the display panel via a plurality of scan lines, and a datadriver 1206 connected to the display panel via a plurality of datalines. The display panel 1200 of the present invention has beendescribed in the description above, and will not be repeated again.

FIG. 13 is a block diagram illustrating an electronic device accordingto one embodiment of the present invention. Referring to FIG. 13, anelectronic device 1300 comprises, for example, the display device 1200as shown in FIG. 12 and an input device 1308 connected to the displaydevice 1200. The input device 1308 may be adopted for receiving theimage data, the command from the user and so on. The display device 1200of the present invention has been described in the description above,and will not be repeated again.

Accordingly, in the present invention, since the direction of theabsorption axis of the polarizer of the LCD panel is not substantiallyparallel to the direction of the rubbing of the alignment surface of thesubstrates of the LCD panel, the problem of the low contrast ratio asthe azimuthal coordinate is close to 270°, the problem of the gray scaleinversion and the reduction of brightness when a user wears such as asunglasses are improved drastically.

The foregoing description of the embodiment of the present invention hasbeen presented for purposes of illustration and description. It is notintended to be exhaustive or to limit the invention to the precise formor to exemplary embodiments disclosed. Accordingly, the foregoingdescription should be regarded as illustrative rather than restrictive.Obviously, many modifications and variations will be apparent topractitioners skilled in this art. The embodiments are chosen anddescribed in order to best explain the principles of the invention andits best mode practical application, thereby to enable persons skilledin the art to understand the invention for various embodiments and withvarious modifications as are suited to the particular use orimplementation contemplated. It is intended that the scope of theinvention be defined by the claims appended hereto and their equivalentsin which all terms are meant in their broadest reasonable sense unlessotherwise indicated. It should be appreciated that variations may bemade in the embodiments described by persons skilled in the art withoutdeparting from the scope of the present invention as defined by thefollowing claims. Moreover, no element and component in the presentdisclosure is intended to be dedicated to the public regardless ofwhether the element or component is explicitly recited in the followingclaims.

1. A display panel, comprising: a first substrate having a firstalignment surface in a first alignment direction; a second substrateparallel and opposite to the first substrate, having a second alignmentsurface in a second alignment direction; liquid crystal moleculesdisposed between the first alignment surface and the second alignmentsurface; a first polarizer having a first edge and a first absorptionaxis parallel to the first edge, and disposed over the first substrate;a second polarizer having a second edge and a second absorption axisparallel to the second edge, and disposed over the second substrate; afirst optical compensation film having a first optical axis and disposedbetween the first substrate and the first polarizer; and a secondoptical compensation film having a second optical axis and disposedbetween the second substrate and the second polarizer; wherein the firstoptical axis and the first alignment direction as well as the secondoptical axis and the second alignment direction are substantiallyparallel, and wherein an angle between the first absorption axis and thefirst alignment direction as well as an angle between the secondabsorption axis and the second alignment direction are in a range ofabout 45° respectively.
 2. The display panel of claim 1, wherein theangle between the first alignment direction and the second alignmentdirection is in a range of about 90°.
 3. The display panel of claim 1,wherein an angle between the first optical axis and the first alignmentdirection as well as an angle between the second optical axis and thesecond alignment direction are in a range of about ±5° respectively. 4.The display panel of claim 1, wherein a sign of a difference betweendouble refractive index of the liquid crystal molecules is differentfrom a sign of a difference between double refraction index of the firstoptical compensation or the second optical compensation film.
 5. Thedisplay panel of claim 1, wherein the first polarizer is disposed on aside of the first substrate outside of the liquid crystals and thesecond polarizer is disposed on a side of the second substrate outsideof the liquid crystals.
 6. A display device, comprising: a displaypanel; a scan driver connected to the display panel via a plurality ofscan lines; and a data driver connected to the display panel via aplurality of data lines; wherein the display panel comprises: a firstsubstrate having a first alignment surface in a first alignmentdirection; a second substrate parallel and opposite to the firstsubstrate, having a second alignment surface in a second alignmentdirection; liquid crystal molecules disposed between the first substrateand the second substrate; a first polarizer having a first edge and afirst absorption axis parallel to the first edge, and disposed over thefirst substrate; a second polarizer having a second edge and a secondabsorption axis parallel to the second edge, and disposed over thesecond substrate; a first optical compensation film having a firstoptical axis and disposed between the first substrate and the firstpolarizer; and a second optical compensation film having a secondoptical axis and disposed between the second substrate and the secondpolarizer; wherein the first optical axis and the first alignmentdirection as well as the second optical axis and the second alignmentdirection are substantially parallel, and wherein an angle between thefirst absorption axis and the first alignment direction as well as anangle between the second absorption axis and the second alignmentdirection are in a range of about 45° respectively.
 7. The displaydevice of claim 6, wherein the angle between the first alignmentdirection and the second alignment direction is in a range of about 90°.8. The display device of claim 6, wherein an angle between the firstoptical axis and the first alignment direction as well as an anglebetween the second optical axis and the second alignment direction arein a range of about ±5° respectively.
 9. The display device of claim 6,wherein a sign of a difference between double refractive index of theliquid crystal molecules is different from a sign of a differencebetween double refractive index of the first optical compensation filmor the second optical compensation film.
 10. The display device of claim6, wherein the first polarizer is disposed on a side of the firstsubstrate outside of the liquid crystals, and the second polarizer isdisposed on a side of the second substrate outside of the liquidcrystals.
 11. An electronic device, comprising: an input device forproviding an input data; a display device for displaying an imagereceived from the input data, comprising: a display panel; a scan driverconnected to the display panel via a plurality of scan lines; and a datadriver connected to the display panel via a plurality of data lines;wherein the display panel comprises: a first substrate having a firstalignment surface in a first alignment direction; a second substrateparallel and opposite to the first substrate, having a second alignmentsurface in a second alignment direction; liquid crystal moleculesdisposed between the first substrate and the second substrate; a firstpolarizer having a first edge and a first absorption axis parallel tothe first edge, and disposed over the first substrate; a secondpolarizer having a second edge and a second absorption axis parallel tothe second edge, and disposed over the second substrate; a first opticalcompensation film having a first optical axis and disposed between thefirst substrate and the first polarizer; and a second opticalcompensation film having a second optical axis and disposed between thesecond substrate and the second polarizer; wherein the first opticalaxis and the first alignment direction as well as the second opticalaxis and the second alignment direction are substantially parallel, andwherein an angle between the first absorption axis and the firstalignment direction as well as an angle between the second absorptionaxis and the second alignment direction are in a range of about 45°respectively.
 12. The electronic device of claim 11, wherein the anglebetween the first alignment direction and the second alignment directionis in a range of about 90°.
 13. The electronic device of claim 11,wherein an angle between the first optical axis and the first alignmentdirection as well as an angle between the second optical axis and thesecond alignment direction are in a range of about ±5° respectively. 14.The electronic device of claim 11, wherein a sign of a differencebetween double refractive index of the liquid crystal molecules isdifferent from a sign of a difference between double refractive index ofthe first optical compensation film or the second optical compensationfilm.
 15. The electronic device of claim 11, wherein the first polarizeris disposed on a side of the first substrate outside of the liquidcrystals, and the second polarizer is disposed on a side of the secondsubstrate outside of the liquid crystals.